Patent US4429873A successfully refreshed from Google Patents.
US4429873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tennis racket
Assignee: SNAUWAERT EN DEPLA NV
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Filing: 1981-08-12
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Granted: 1984-02-07
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Expires: 2001-08-12
Abstract
Abstract There is described a tennis racket the frame and shaft of which are formed by synthetic resin-impregnated fibres, such as glass and/or carbon fibres, aromatic polyamide or boron fibres, and the core both of the frame and the shaft is preferably filled with a synthetic foam with the purpose of determining the profile of those components formed by the fibres, in which inside the core is present at least in places in the frame and/or the shaft, at least one wood layer.
Inventors
- 👤 Joris Van Raemdonck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:38
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/10; A63B60/00; A63B60/02; A63B60/54; Y; Y10; Y10S; Y10S273/00; Y10S273/07; Y10S273/23
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
Tennis racket comprising: a frame; a shaft; said frame and said shaft being formed by synthetic fibres or synthetic resin-impregnated fibres; an inner core, made of synthetic foam, encompassed by said fibres and at least one wooden layer reinforcing said synthetic foam; a one portion of side of said at least one wooden layer in contact with said fibres; and a portion of the other side of said at least one wooden layer in contact with said foam core.
Claim 2
Dependent Claim
79 words
Tennis racket comprising: a frame; a shaft; said frame and said shaft being formed by synthetic fibres or synthetic resin-impregnated fibres; an inner core, made of synthetic foam, encompassed by said fibres and at least one wooden layer reinforcing said synthetic foam; a one portion of side of said at least one wooden layer in contact with said fibres; and a portion of the other side of said at least one wooden layer in contact with said foam core.
Claim 3
Dependent Claim
36 words
Tennis racket as defined in claim 1, wherein said core comprises at least in the shaft of the tennis racket at least in one place an insert made of a material having a high specific gravity.
Claim 4
Dependent Claim
19 words
Tennis racket as define in claim 2, wherein said material having a high specific gravity is a heavy metal.
Claim 5
Dependent Claim
36 words
Tennis racket as defined in claim 1, wherein said frame comprises in at least two places on each side of the geometric axis of the racket inserts made of a material having a high specific gravity.
Claim 6
Dependent Claim
19 words
Tennis racket as defined in claim 4, wherein said material having a high specific gravity is a heavy metal.
Claim 7
Dependent Claim
15 words
Tennis racket as defined in claim 1, wherein said synthetic foam is a synthetic resin.
Claim 8
Dependent Claim
90 words
Tennis racket comprising a frame and a shaft; a synthetic foam core determining a shape of said frame and said shaft; at least one wooden layer reinforcing said foam core; synthetic fibres or synthetic resin-impregnated fibres, encompassing said foam core and said at least one wooden layer, providing reinforcement for said tennis racket; a portion of one side of said at least one wooden layer in contact with said fibres; and a portion of the other side of said at least one wooden layer in contact with said foam core.
Claim 9
Dependent Claim
90 words
Tennis racket comprising a frame and a shaft; a synthetic foam core determining a shape of said frame and said shaft; at least one wooden layer reinforcing said foam core; synthetic fibres or synthetic resin-impregnated fibres, encompassing said foam core and said at least one wooden layer, providing reinforcement for said tennis racket; a portion of one side of said at least one wooden layer in contact with said fibres; and a portion of the other side of said at least one wooden layer in contact with said foam core.
Claim 10
Dependent Claim
15 words
Tennis racket according to claim 7, wherein said at least one wooden layer is continuous.
Claim 11
Dependent Claim
27 words
Tennis racket according to claim 7, further comprising an insert made of a material having a high specific gravity disposed in said shaft of said tennis racket.
Claim 12
Dependent Claim
38 words
Tennis racket according to claim 7, further comprising an insert made of a material having a high specific gravity disposed in said frame of said tennis racket on each side of the geometric axis of said tennis racket.
Claim 13
Dependent Claim
161 words
Tennis racket comprising a frame and a shaft; a synthetic foam core determining a shape of said frame and said shaft; at least one wooden layer reinforcing said foam core; synthetic fibres or synthetic resin-impregnated fibres, encompassing said foam core and said at least one wooden layer, providing reinforcement for said tennis racket; a portion of one side of said at least one wooden layer in contact with said fibres; a portion of the other side of said at least one wooden layer in contact with said foam core; a first insert of oblong U-shaped disposed in said shaft of said tennis racket; and a second and third insert disposed in said frame of said tennis racket on either side of the geometric axis thereof, said inserts having high specific weights, being positioned so as to determine the center of gravity of said racket, and substantially increasing the movement of inertia of said racket without adversely changing the local stiffness thereof.
Claim 14
Dependent Claim
161 words
Tennis racket comprising a frame and a shaft; a synthetic foam core determining a shape of said frame and said shaft; at least one wooden layer reinforcing said foam core; synthetic fibres or synthetic resin-impregnated fibres, encompassing said foam core and said at least one wooden layer, providing reinforcement for said tennis racket; a portion of one side of said at least one wooden layer in contact with said fibres; a portion of the other side of said at least one wooden layer in contact with said foam core; a first insert of oblong U-shaped disposed in said shaft of said tennis racket; and a second and third insert disposed in said frame of said tennis racket on either side of the geometric axis thereof, said inserts having high specific weights, being positioned so as to determine the center of gravity of said racket, and substantially increasing the movement of inertia of said racket without adversely changing the local stiffness thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |